Coal-screen



(No Model.)

S. GRIFFITHS.

GOAL SCREEN. No. 481,754. Patented Aug. 30,1892.

Ema.

WIZIVESSE'S- [/V'VE/VJZ 0753 I UNTTED STATES PATENT OFFICE.

SAMUEL GRIFFITHS, OF WEIR, KANSAS.

COAL-SCREEN.

PECIFICATION forming part of Letters Patent No. 481,754, dated August30, 1892.

Application filed February 20 1892. Serial No. 422.221. (No model.)

To all whom it may concern.-

Be it known that I, SAMUEL GRIFFITHS, a citizen of the United States,and a resident of Weir, in the county of Cherokee and State of Kansas,have invented certain new and useful Improvements in Coal-Screens; and Ido hereby declare that the following is a full, clear, and exactdescription of the invention, which will enable others skilled in theart to which it appertains to make and use the same, reference being hadto the accompanying drawings, which form a part of this specification.

My invention relates to improvements in coal-screens for separatingnut-coal from the slack of that character in which the coalfrom amine-shaft is received upon inclinedcbars fixed in a suitable frame atproper distances apart to allow the lumps of a specified grade or sizeto fall through the intervening spaces, while the larger sizes arecarried down the bars and escape at the bottom of the apparatus.

In this class of apparatus it is customary to employ a number oflaborers armed with rakes or scrapers, by means of which the coal, as itis fed to the separating-bars, is agitated and prevented from cloggingorgettingwedged in the spaces between the bars.

The object of my invention is to provide improved means for agitatingthe coal and accelerating its movement upon the bars, whereby not onlyis clogging prevented and efficiency promoted, but a great saving incost and labor effected.

The invention consists in the novel construction and combination ofparts hereinafterfully described, and specifically pointed out in theclaims.

In the accompanying drawings, Figure 1 is a central longitudinal sectionof a coal-screen orseparatorconstructedin accordance with my invention.Fig. 2 is a plan view of the same.

In the said drawings the reference-numeral 1 denotes the base of theapparatus, consisting of side and end beams suitably connected together,forming a rectangular frame. At each end of this frame are secureduprights or standards 2, connected at their upper ends by side beams 3and provided at a short distance below the said side beams with beams 4,parallel therewith. At one end of the apparatus the uprights near theirupper ends are provided with a cross-beam 5, upon which rests a bar 6,provided with a number of parallel slots at proper distances apart,

which receive the upper ends of the inclined separating-bars 7, thelower ends of which are received in corresponding slots in a cross-bar 8at the opposite end of the apparatus. Secured to the bars 6 and 7 at theends thereof are side-boards 9, which are parallel with .theseparating-bars, but which project upwardly, forming walls which confinethe coal to the bars and prevent it escaping at the sides. These wallsare secured to the uprights or standards, forming an inclined screen,the bars being at such distance apart that lumps of a certain specifiedsize can escape through the intervening spaces, while the larger lumpswill descend to the lower end of the screen. The base, the uprights, andthe side beams constitute a supporting-frame for the screen.

Journaled in bearings 10 near the upper ends of. the uprights at theexit end of the apparatus is a transverse oscillating shaft 12,connected with any suitable motive power. This is provided with cranks13, to which are pivoted bars or rods 14:, which are secured at theiropposite ends to an angularor inverted- V-shaped transverseplate15.Gonnectedwith these bars just in front of the said plate is a transversebar 16, to which are pivoted side bars 17, secured at their other endsto a similar V- shaped plate 18. Also pivoted to said bar 16 are bars19, carrying a fiat transverse bar or plate 20, which is located aboutmidway between the plates and 18. These plates all rest upon and contactwith the inclined separating-bars.

The operation is as follows: The coal is fed to the screen at the upperrear end thereof and an oscillating motion given to the shaft 12, whichwill in turn reciprocate the scrap ing-plates upon the separating-bars.The plates 15 and 18 will agitate the coal and prevent it from clogging,and owing to their peculiar shape will allow the larger lumps to fallover the same, While the smaller lumps will fall through the spacesbetween the bars. The flat intermediate plate 20 serves to disengage anyof the lumps which may become wedged between the bars, besides aiding inagitating the coal and accelerating its motion.

Having thus described my invention, what I claim is- 1. In a coal screenor separator, the combination, with the frame, the inclinedseparating-bars with intervening spaces, and the side Walls, of theinverted-V-shaped scrapingplates, the intermediate flat plate. andmeans, substantially as described, for reciprocating said plates.

2. In a coal screen or separator, the combination, with the frame, theinclined separating-bars with intervening spaces, and the side Walls, ofthe oscillating shaft provided With cranks, the bars pivoted thereto,the transverse inverted -V- shaped plate secured to said [5 bars, thetransverse bar, the rods pivoted thereto and provided with aninverted-V- shaped plate, the intermediate flat plate, and the rodsconnected therewith, pivoted to said transverse bar, substantially asdescribed.

In testimony that I claim the foregoing as my own I have hereuntoaflixed my signature in presence of two witnesses.

SAMUEL GRIFFITHS.

\Vitnesses:

.I. M. BLAISDELL, C. IV. H OAG.

